Toyota Tacoma 2015-2018 Service Manual: Operation History List

The cause of a malfunction is stored in the RAM or EEPROM in the certification
ECU (smart key ECU assembly). As the cause of a malfunction stored in the
RAM will be cleared when the cable is disconnected from the negative (-)
battery terminal, do not disconnect the cable from the negative (-) battery
terminal before checking and recording are complete.

When using the Techstream with the engine switch off, connect the Techstream
to the DLC3 and turn a courtesy light switch on and off at intervals of
1.5 seconds or less until communication between the Techstream and the vehicle
begins. Then select the vehicle type under manual mode and enter the following
menus: Body Electrical / Smart Key. While using the Techstream, periodically
turn a courtesy light switch on and off at intervals of 1.5 seconds or less
to maintain communication between the Techstream and the vehicle.

1. OPERATION HISTORY

HINT:

The certification ECU (smart key ECU assembly) stores the operation history of
the smart key system and it can be read using the Techstream.

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, key registration was suspended after one or
more ID code had successfully been registered due to a malfunction of the
immobiliser amplifier, such as a short to ground. The ECU code was registered
successfully. DTC B278A was stored.

Registration Failed; Vehicle ID Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch for registration, electrical key transmitter
sub-assembly registration was suspended after one or more ID code had successfully
been registered because time had expired due to the vehicle ID code sent
by the electrical key transmitter sub-assembly not matching the code stored
by the certification ECU (smart key ECU assembly). The ECU code was registered
successfully. A recognition code is used between the electrical key transmitter
sub-assembly and the certification ECU (smart key ECU assembly). Although
the vehicle ID stored in the certification ECU (smart key ECU assembly)
should be registered to the electrical key transmitter sub-assembly when
the electrical key transmitter sub-assembly was registered, it was not.
"Registration Failed; Vehicle ID Error" is displayed when trying to register
an electrical key transmitter sub-assembly of another vehicle. If electrical
key transmitter sub-assembly registration could not be completed successfully
after trying to register another electrical key transmitter sub-assembly,
the certification ECU (smart key ECU assembly) might be malfunctioning.

Registration Failed; Except Vehicle ID Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch for registration, electrical key transmitter
sub-assembly registration was suspended after one or more ID code had successfully
been registered due to noise or the transmitter battery being low. The ECU
code was registered successfully.

Registration Failed; Key Already Registered

As a registered electrical key transmitter sub-assembly was held near
the engine switch by mistake, electrical key transmitter sub-assembly registration
was suspended after one or more ID code had successfully been registered.
The ECU code was registered successfully.

Registration Failed; ID Code Write Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was suspended after one or more ID code had successfully been registered
due to the certification ECU (smart key ECU assembly) not being able to
store the electrical key transmitter sub-assembly information correctly.
The ECU code was registered successfully.

Registration Failed; Key Info Abnormal

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was suspended after one or more ID code had successfully been registered
due to the certification ECU (smart key ECU assembly) not being able to
store the electrical key transmitter sub-assembly ID code correctly. The
ECU code was registered successfully.

The following are be suspected:

Registration of electrical key transmitter sub-assemblies is to be done
one by one. If 2 electrical key transmitter sub-assemblies were held near
the engine switch at the same time, incorrect registration information was
stored in the certification ECU (smart key ECU assembly), suspending registration.

HINT:

Reregister the electrical key transmitter sub-assemblies using the correct
procedure.

Failed Registration Mode

Although the mode was switched to a registration mode using the Techstream,
the mode was not successfully switched (another mode may have already been
selected).

Vehicle ID not set

Although the vehicle ID should be stored in the certification ECU (smart
key ECU assembly) at the factory, the ID could not be stored successfully
(malfunction of the certification ECU (smart key ECU assembly)).

Key Registration Max

Registration was not possible because the maximum number of electrical
key transmitter sub-assemblies had already been registered to the certification
ECU (smart key ECU assembly).

HINT:

If a new electrical key transmitter sub-assembly needs to be
registered, such as when one of the registered electrical key transmitter
sub-assemblies has been lost, erase an unnecessary ID code first.
(See page ).

If the certification ECU (smart key ECU assembly) has been replaced
with a new one, there should be no registered electrical key transmitter
sub-assemblies. If any exist, replace the new certification ECU
(smart key ECU assembly) with another new certification ECU (smart
key ECU assembly).

Vehicle Speed Too High

Electrical key transmitter sub-assembly registration was not possible
because the vehicle speed was 5 km/h or more (electrical key transmitter
sub-assembly registration is possible only while the vehicle is stopped).

Transponder Key Amp Abnormal

Although a registered electrical key transmitter sub-assembly was held
near the engine switch, the registered electrical key transmitter sub-assemblies
could not be confirmed and electrical key transmitter sub-assembly registration
was not possible due to a malfunction of the immobiliser amplifier, such
as a short to ground. DTC B278A was stored.

Immobiliser Verification Error

Although a registered electrical key transmitter sub-assembly was held
near the engine switch, ID number certification between the electrical key
transmitter sub-assembly and the certification ECU (smart key ECU assembly)
did not succeed. In this situation, the following are suspected:

The registered electrical key transmitter sub-assembly was not
held near the engine switch properly.

The engine immobiliser system certification procedure is to hold an electrical
key transmitter sub-assembly near the engine switch to check whether or
not the electrical key transmitter sub-assembly ID information matches that
of the certification ECU (smart key ECU assembly).

No ECU Response

A recognition code is used between the certification ECU (smart key ECU
assembly) and steering lock ECU (steering lock actuator or UPR bracket assembly).
Electrical key transmitter sub-assembly registration was not possible due
to the certification ECU (smart key ECU assembly) not receiving a response
from the steering lock ECU (steering lock actuator or UPR bracket assembly).
If no malfunction was found in the ECU connectors or wire harnesses during
inspection, a malfunction in either of the ECUs is suspected.

L Code Verification Error

A recognition code (L code) is used between the certification ECU (smart
key ECU assembly) and steering lock ECU (steering lock actuator or UPR bracket
assembly). Registration was not possible due to these codes not matching.

If no malfunction was found in all the ECU connectors or wire harnesses
at inspection, a malfunction in one of the ECUs is suspected.

HINT:

The code of any ECU that has been registered to another vehicle in the
past will not match.

Key Verification: Max Number

The number of registered electrical key transmitter sub-assemblies stored
in the certification ECU (smart key ECU assembly) exceeded the maximum.

Key Verification: Amp Abnormal

Although all of the electrical key transmitter sub-assemblies had been
held near the engine switch to confirm their registration, the registered
electrical key transmitter sub-assemblies could not be confirmed and electrical
key transmitter sub-assembly registration was not possible due to a malfunction
of the immobiliser amplifier, such as a short to ground. DTC B278A was stored.

Key Verification: Read Error

Although all of the electrical key transmitter sub-assemblies had been
held near the engine switch to confirm their registration, electrical key
transmitter sub-assembly registration was not possible due to immobiliser
recognition not succeeding.

The following are suspected:

The registered electrical key transmitter sub-assembly was not
held against the engine switch properly.

The immobiliser recognition procedure is to hold an electrical key transmitter
sub-assembly near the engine switch to check whether the ID information
of the electrical key transmitter sub-assembly and that of the certification
ECU (smart key ECU assembly) match or not.

Unverified Key

Although all of the electrical key transmitter sub-assemblies had been
held near the engine switch to confirm their registration, electrical key
transmitter sub-assembly registration was not possible due to some of the
electrical key transmitter sub-assemblies remaining unconfirmed.

The following are suspected:

Some of the registered electrical key transmitter sub-assemblies
were not held near the engine switch properly.

Some of the registered electrical key transmitter sub-assemblies
had not been held near the engine switch yet.

HINT:

Prepare all of the registered electrical key transmitter sub-assemblies
and restart system certification.

Key Info Abnormal

Although all of the electrical key transmitter sub-assemblies had been
held near the engine switch to confirm their registration, electrical key
transmitter sub-assembly registration was not possible due to each key ID
not being registered correctly in the certification ECU (smart key ECU assembly).

The following are suspected:

Registration of electrical key transmitter sub-assemblies was supposed
to be done one by one. If 2 electrical key transmitter sub-assemblies were
held against the engine switch at the same time, mixed up registration information
would be stored in the certification ECU (smart key ECU assembly) resulting
in suspension of the registration.

HINT:

Reregister the electrical key transmitter sub-assemblies using the correct
procedure.

Transponder Key Amp Error

Although an unregistered electrical key transmitter sub-assembly was
held against the engine switch, the electrical key transmitter sub-assembly
registration was suspended after one or more ID code registration had been
completed successfully due to a malfunction of the immobiliser amplifier
(short to ground). The ECU code was registered successfully. DTC B278A was
stored.

New Key Registration Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was not possible due to engine immobiliser system certification not succeeding.

The following are suspected:

The registered electrical key transmitter sub-assembly was not
held against the engine switch properly.

The immobiliser recognition procedure is to hold an electrical key transmitter
sub-assembly against the engine switch to check whether the ID information
of the electrical key transmitter sub-assembly and that of the certification
ECU (smart key ECU assembly) match or not.

New Key Vehicle ID Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was not possible due to the vehicle ID code sent by the electrical key transmitter
sub-assembly not matching the code stored by the certification ECU (smart
key ECU assembly).

Recognition code is used between the electrical key transmitter sub-assembly
and the certification ECU (smart key ECU assembly). Although the vehicle
ID stored in the certification ECU (smart key ECU assembly) should be registered
to the electrical key transmitter sub-assembly on the occasion of the electrical
key transmitter sub-assembly registration, it was not successful.

"Registration Failed; Vehicle ID Error" was displayed when trying to
register an electrical key transmitter sub-assembly of other vehicle. If
the electrical key transmitter sub-assembly registration could not be completed
successfully after trying to register another electrical key transmitter
sub-assembly, the certification ECU (smart key ECU assembly) may be malfunctioning.

New Key Registration Failed

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was not possible due to the key ID code sent by the electrical key transmitter
sub-assembly not matching the code stored by the certification ECU (smart
key ECU) due to noise or the transmitter battery being low.

"New Key Vehicle ID Error" was displayed due to the vehicle ID registered
in the certification ECU (smart key ECU assembly) and the vehicle ID registered
in the electrical key transmitter sub-assembly not matching.

New Key Already Registered

Electrical key transmitter sub-assembly registration was not possible
due to a registered electrical key transmitter sub-assembly being held near
the engine switch instead of an unregistered electrical key transmitter
sub-assembly by mistake.

New Key ID Code Error

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was not possible due to the certification ECU (smart key ECU assembly) not
being able to store the key information correctly. If registration cannot
be completed successfully after a second attempt, the certification ECU
(smart key ECU assembly) is malfunctioning.

New Key Information Abnormal

Although an unregistered electrical key transmitter sub-assembly was
held near the engine switch, electrical key transmitter sub-assembly registration
was not possible due to the certification ECU (smart key ECU assembly) not
being able to store the key information correctly.

The following are suspected:

Registration of electrical key transmitter sub-assemblies is supposed
to be done one by one. If 2 electrical key transmitter sub-assemblies are
held against the engine switch at the same time, mixed up registration information
will be stored in the certification ECU (smart key ECU assembly) resulting
in suspension of the registration.

HINT:

Reregister the electrical key transmitter sub-assemblies using the correct
procedure.

No Response Registering L/S Code

Registration of the connecting ECU (steering lock ECU (steering lock
actuator or UPR bracket assembly)) was not possible due to the certification
ECU (smart key ECU assembly) not receiving a response from the steering
lock ECU (steering lock actuator or UPR bracket assembly).

HINT:

Inspect the connectors and wire harnesses.

L Code Verification NG

L code registration was not possible. A recognition code is used between
the certification ECU (smart key ECU assembly) and the steering lock ECU
(steering lock actuator or UPR bracket assembly).

The following are suspected:

The connectors, wire harnesses or ECUs might be malfunctioning.

Key Number Write Error

ECU code registration was not possible due to the certification ECU (smart
key ECU assembly) not being able to correctly store the number of electrical
key transmitter sub-assemblies.

B Code Verification NG

B code registration was not possible. A recognition code is used between
the certification ECU (smart key ECU assembly) and the main body ECU (multiplex
network body ECU).

The connectors, wire harnesses or ECUs might be malfunctioning.

Radio Wave Interference:

Parameter Name

Content

Lock / Key RF Signal Interference

When entry lock operation was performed, the electrical key transmitter
sub-assembly could not be confirmed due to wave interference.

Unlock / Key RF Signal Interference

When entry unlock operation was performed, the electrical key transmitter
sub-assembly could not be confirmed due to wave interference.

Operating Engine Switch / Key RF Signal Interference

When the engine switch was operated, the electrical key transmitter sub-assembly
could not be confirmed due to wave interference.

Operating Trunk Switch / Key RF Signal Interference

When entry trunk operation was performed, the electrical key transmitter
sub-assembly could not be confirmed due to wave interference.

Other materials:

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